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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a94ebb8c61c046f88dd8122352ac11a6df7659d4dcc30e8ffa04c888b48771a' 
  AND token = 'XT1MjoRR1A8GCHitq1uQjbJqEWmIzB8/kU7c6TBQpKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}